健康栏目的实现

预期效果

实际效果：程序出现闪退或停止运行，正在尝试排错。。。



Error位置



HealthActivity.java

package com.walkersimulate;

import java.util.ArrayList;
import java.util.List;

import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class HealthActivity extends Activity
{
private int currIndex;// 当前页卡编号
private TextView tvCursor;
private TextView tvHealthNews;
private TextView tvIllnessDefense;
private ViewPager vpHealth;
private ImageView ivHealthBack;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_health);
initViews();
initCursor();
initViewPager();
setListeners();
}
private void initViews(){
ivHealthBack=(ImageView)findViewById(R.id.iv_HealthBack);
tvCursor=(TextView)findViewById(R.id.cursor);
tvHealthNews=(TextView)findViewById(R.id.tv_healthnews);
//tvIllnessDefense=(TextView)findViewById(R.id.tv_IllDefense);
vpHealth= (ViewPager)findViewById(R.id.viewpager);
}
private void initCursor(){
Display display= getWindow().getWindowManager().getDefaultDisplay();
DisplayMetrics metrics= new DisplayMetrics();
display.getMetrics(metrics);
// 取得手机屏幕宽度的一半
int tabLineLength=metrics.widthPixels/2;
// 设置游标的宽度为屏幕宽度的一半
LayoutParams lp=(LayoutParams) tvCursor.getLayoutParams();
lp.width=tabLineLength;
tvCursor.setLayoutParams(lp);
}
private void initViewPager(){
vpHealth= (ViewPager)findViewById(R.id.viewpager);
List<View>views =new ArrayList<View>();
views.add(new HealthWebView(this) .getView("http://cms.hxky.cn/wap/jkxz/"));
views.add(new HealthWebView(this) .getView("http://cms.hxky.cn/wap/jbfz/"));
vpHealth.setAdapter(new HealthViewPagerAdapter(views));
// 给 ViewPager 设置适配器
vpHealth.setCurrentItem(0);
// 设置当前显示标签页为第一页
}
private void setListeners(){
// 返回按钮
ivHealthBack.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0)
{ finish(); }
});
// 点击健康须知
tvHealthNews.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View view){
vpHealth.setCurrentItem(0);
}
});
// 点击疾病防治
tvIllnessDefense.setOnClickListener(new OnClickListener(){

@Override public void onClick(View view)
{ vpHealth.setCurrentItem(1); }
});
vpHealth.setOnPageChangeListener(new OnPageChangeListener(){

@Override
public void onPageSelected(int position){
currIndex=position;
}
@Override
public void onPageScrolled(int position,float percent,int ag2){
LinearLayout.LayoutParams ll = (android.widget.LinearLayout.LayoutParams)tvCursor .getLayoutParams();

if(currIndex== position){
ll.leftMargin=(int)(currIndex*tvCursor.getWidth()+percent *tvCursor.getWidth());
}else if(currIndex>position){
ll.leftMargin=(int)(currIndex*tvCursor.getWidth()-(1-percent) *tvCursor.getWidth()); } tvCursor.setLayoutParams(ll);
}
@Override public void onPageScrollStateChanged(int position){
}
});
}

}

HealthViewPagerAdapter.java

package com.walkersimulate;

import java.util.List;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

public class HealthViewPagerAdapter extends PagerAdapter
{
private List<View>viewList;
public HealthViewPagerAdapter(List<View>viewList){
this.viewList=viewList;
}
@Override
public int getCount(){
return viewList.size();
}
@Override
public boolean isViewFromObject(View view,Object object){
return view==object;
}
@Override
public Object instantiateItem(ViewGroup container,int position){
container.addView(viewList.get(position));
return viewList.get(position);
}
@Override
public void destroyItem(ViewGroup container,int position,Object object){
container.removeView(viewList.get(position));
}
}

HealthWebView.java

package com.walkersimulate;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class HealthWebView{
private Context context;

public HealthWebView(Context context){
this.context= context;
}

public View getView(String url){
View view =LayoutInflater.from(context).inflate(R.layout.pagerofhealth,null);
WebView webView=(WebView)view.findViewById(R.id.wvHealth);
webView.loadUrl(url);
webView.getSettings().setJavaScriptEnabled(true);
//禁止系统浏览器打开页面
webView.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view,String url){
view.loadUrl(url);
return true;
}
});
return view;
}
}

activity_health.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".HealthActivity">
<include  layout="@layout/health_layout_titlebar"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!-- 健康新知 -->
<TextView
android:id="@+id/tv_healthnews"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:padding="6dp"
android:text="@string/healthnews"
android:textSize="18sp"/>
<!-- 疾病防治 -->
<TextView
android:id="@+id/tv_healthill"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:padding="6dp"
android:text="@string/illdefense"
android:textSize="18sp"/>
</LinearLayout>
<TextView
android:id="@+id/cursor"
android:layout_width="125dp"
android:layout_height="5dp"
android:layout_marginLeft="20dp"
android:background="#990033"/>

<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</LinearLayout>

health_layout_titlebar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.
4000
android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/titlebar_bg">
<ImageView
android:id="@+id/iv_HealthBack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:onClick=""
android:paddingLeft="6dp"
android:src="@drawable/icons_health_back"/>
<TextView android:id="@+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:gravity="center"
android:text="健康"
android:textColor="#ffffff"
android:textSize="15sp"/>

</LinearLayout>

pagerofhealth.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/wvHealth"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</RelativeLayout>